LibC: Add dummy setjmp.h

libc/include/setjmp.h

@@ -0,0 +1,19 @@
+#pragma once
+
+#include <sys/cdefs.h>
+
+// https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/setjmp.h.html
+
+__BEGIN_DECLS
+
+typedef int* jmp_buf;
+typedef int* sigjmp_buf;
+
+void	_longjmp(jmp_buf, int);
+void	longjmp(jmp_buf, int);
+void	siglongjmp(sigjmp_buf, int);
+int		_setjmp(jmp_buf);
+int		setjmp(jmp_buf);
+int		sigsetjmp(sigjmp_buf, int);
+
+__END_DECLS